摘要
对研制的两种硬面药芯焊丝HDY704、HDY502焊态和焊后热处理堆焊层金属的显微组织及耐磨性能进行了研究,探讨了堆焊层金属的磨损机理。结果表明:合金钢硬面药芯焊丝HDY704和不锈钢硬面药芯焊丝HDY502堆焊层金属的显微组织均为马氏体加少量残余奥氏体;焊后热处理均能提高其耐磨性能;热处理后HDY502堆焊层金属有弥散碳化物析出使硬度增加近10 HRC,而HDY704堆焊层金属的硬度不变;堆焊层金属的磨损机理为沙粒在压力作用下被压入基体中沿运动方向的切削破坏。
The microstructure and wear resistance of the overlaying welding metal of two new types of hardfacing flux-cored wire HDYT04 and HDYS02 were studied. Wear resistance of the overlaying welding metal was analyzed before and after heat treatment. The microstructure of the welding metal of HDYT04 and HDYS02 was martensite and residual austenite. Postweld heat treatment increased wear resistance. The hardness of the overlaying welding metal of HDYS02 was increased by 10 HRC, which was caused by the disperse precipitation of carbides. The hardness of the overlaying welding metal of HDYT04 remained constant with no disperse precipitation of carbides. The mechanism of wear resistance of the hardfacing overlaying welding metal was cutting damage of sand grains pressed into base metal by vertical stress component in the direction of moving orientation.
出处
《机械工程材料》
CAS
CSCD
北大核心
2006年第8期57-60,共4页
Materials For Mechanical Engineering
基金
湖北省科技攻关重点项目(2002AA107B03)
关键词
硬面药芯焊丝
堆焊
耐磨性
hardfacing flux-cored wirel overlaying welding
wear resistance
